Table 2: Mean microhardness change (in Vicker’s unit) by application of acid for different fissure sealant groups

Mean SμH difference within the groups

Mean SμH difference between the groups

95% confidence interval

Groups

Mean SμH difference ± std. deviation

Min.

Max.

p-value*

Groups

Mean SμH difference ± std. std. error

Lower bound

Upper bound

p-value*

G1 (n = 24)

269.17 ± 47.49

168.64

379.33

0.000

G1-G2

117.78 ± 10.22

97.40

138.16

0.000

G2 (n = 25)

151.39 ± 23.96

99.36

201.39

G1-G3

93.50 ± 10.22

73.12

113.89

0.000

G3 (n = 25)

175.79 ± 32.39

110.09

224.85

G2-G3

24.28 ± 10.12

4.10

44.45

0.019

*Statistically significant if p < 0.05